Question

我设法将得分正确保存到SharedPreferences以及保存到高分。但是，当检查以前的分数是否优于保存的高分时，无论如何都会保存，并且我不知道为什么。

// save score and time if current score is > than current highscore and time is > than current hightime
        if (score > scorePreferences.getInt("highscore", 0) && time > timePreferences.getInt("hightime", 0)) {
            highscorePreferences = getContext().getSharedPreferences("highscore", 0);
            SharedPreferences.Editor editorHighscore = highscorePreferences.edit();
            editorHighscore.putInt("highscore", score);
            editorHighscore.commit();

            timePreferences = getContext().getSharedPreferences("hightime", 0);
            SharedPreferences.Editor editorHightime = timePreferences.edit();
            editorHightime.putInt("hightime", time);
            editorHightime.commit();
        }

然后使用此代码读取游戏活动和高分数活动：

// load score from last session
    private void load() {
        // get score and set text field
        scorePreferences = getSharedPreferences("score", 0);        
        score = scorePreferences.getInt("score", 0);
        scoreValue.setText(Integer.toString(score));

        // get time and set text field
        timePreferences = getSharedPreferences("time", 0);
        time = timePreferences.getInt("time", 0);
        timeValue.setText(Integer.toString(time) + " seconds");

        // get highscore and set text field
        highscorePreferences = getSharedPreferences("highscore", 0);
        highscore = highscorePreferences.getInt("highscore", 0);
        highscoreValue.setText(Integer.toString(highscore));
    }

Answer 1

看起来您对共享首选项使用相同的键，这就是值覆盖的原因。我建议使用sqlite来存储最高分。

Answer 2

应该这样：

if (score > scorePreferences.getInt("highscore", 0)...

......不像是：

if (score > highscorePreferences.getInt("highscore", 0)...

“highscore”键位于您的首选项中，名称相同。看起来您正在从“得分”偏好中读取该键。它不存在，因此始终使用默认值0。

Answer 3

使用一个SharedPreferences对象。要保存，您可以这样做：

SharedPreferences prefs = getSharedPreferences("score", Context.MODE_PRIVATE);

int highscore = prefs.getInt("highscore", 0);
int hightime = prefs.getInt("hightime", 0);

if (score > highscore && time > hightime) {
    SharedPreferences.Editor editor = prefs.editor();

    editor.putInt("highscore", score);
    editor.putInt("hightime", time);
    editor.commit();
}

然后加载它，也使用一个SharedPreferences对象：

private void load() {
    SharedPreferences prefs = getSharedPreferences("score", Context.MODE_PRIVATE);

    score = prefs.getInt("score", 0);
    scoreValue.setText(Integer.toString(score));

    time = prefs.getInt("time", 0);
    timeValue.setText(Integer.toString(time) + " seconds");

    highscore = prefs.getInt("highscore", 0);
    highscoreValue.setText(Integer.toString(highscore));
}

注意：

使用prefs文件名和变量的密钥是个好主意，这样可以避免在保存/检索变量时容易出现错字错误，例如。

public static final String PREFS_NAME = "score";
public static final String KEY_HIGHSCORE = "highscore";
public static final String KEY_HIGHTIME = "hightime";

然后使用它

SharedPreferences prefs = getSharedPreferences(ClassNameWhereItsDeclared.PREFS_NAME, Context.MODE_PRIVATE);

editor.putInt(ClassNameWhereItsDeclared.KEY_HIGHSCORE, score);

等。

我不知道你在哪里节省时间和分数，但你可以像高分和高分一样做到这一点

使用sharedpreferences覆盖先前的高分

3 个答案: